eerdman



(No Model.) 2 Sheets- Sheet 1.

F. E. H ERDMAN;

ELEVATOR.

No. 510,915. I Patented Dec. 19, 1893.

EEG

... 9 N N. Q I y W A & f

r G k Q V w R NI k 0 S T Q Q Q o w, &

flYT/lgaeze: fill E0701?" m: NATIONAL LIYHOGRAPHING coMFAIfv.

(No Model.)

F. E. HliiRDlVIAN.

ELEVATOR.

2 SheetS -Sheet 2.

PatentedDec. 19, 1893.

we NATIONAL LI'INDCHAPNING coMFAmn WASHINGTON. 1:. c4

WIFE/7701?.

Jm qw n...

UNITED STATE PATE T ()FFIGE.

FRANK E. HERDMAN, or INDIANAPOLIS, INDIANA.

ELEVATO R.

SPECIFIUATION forming part of Letters Patent No. 510,915, dated December19, 1893.

. Application filed November 22, 1892. Serial No. 452,784. (No model.)

To all whom it may concern: 7

Be it known that I, FRANK E. HERDMAN, a

c tizen of the United States, residing at Ind1anapolis, county of Marionand State of Indiana, have invented a new and useful Improvement inElevators, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, whichform a part of this specification.

In the drawings:-Figure 1 is a front elevation of elevator and elevatingmechanism. Fig. 2 is a detail of the operation of the bell crank Z. Fig.3 is a modified form of rod U. Fig. 4 is a view of the shifting weightand its connections showing also the operation of the valves 72., h Fig.5 is a View of the springs V V and their supports. Fig. 6 is a detailedview of the butterfly valve used between the cylinder and controllingvalve.

A is the elevating car operating in the shaft B.

O is the traveling sheave connected to the plunger 0'.

D is thecylinder having at its lower end the fixed sheave D. I

E is the lifting cable which passes around the fixed sheaves E O anddown and around a sheave D and up and around the sheave G, and so on thenumber of times required to give the desired gear to the machine, and isfinally connected to the bell crank F.

G is'the conduit leading from the cylinder D to the pressure tank H, andG is the valve upon said conduit. The lever g of this valve is connectedto the sheave g by the rod 9 and the operating cable g passes aroundthis sheave and through the car so that the operator by moving theoperating cable can control the valve in one direction, the weight 9returning the Valve in the other direction.

At the side of the tank H or at any other convenient place is securedthe cylinder M, the right end of which isconnected with the pressuretank L, the other end being open. The piston rod on passes through bothends of the cylinder, the left end of said rod being connected with theend of the bell crank F other than that to which the lifting cable E isconnected. The other end of the piston rod is attached to the arm N ofthe bell crank lever, the latter being pivoted at N. On the horizontalarm n of this bell crank which extends in both directions from the pivotpoint is placed a weight 0. The weightO is upon the arm so that it cantravel from one end to the other of said arm. This weight 0 is attachedto a bell crank Z by means of the link 2' the other end of the bellcrankZ surrounding the rod U, the end of the rod U being connected withthe lever V of a valve V, in the conduit G. Upon this rod are thebuttons z 2 To the cross head of the plunger is attached a rod Textending out and surrounding the rod U and upon this rod U are thestops U U H is the pressure reservoir connected with the pressure tank Hby the pipe h. Upon this pipe is the valve h and upon the outlet pipe11. from the tank H is the valve k The weight 0 is attached to an armthe ends of which are connected to the links R and Q, the link Rconnecting the lever of the valve h, and the link Q connecting the loverof thevalve ha. The relation of the arm and the bell crank F to eachother is such that with the maximum load in the car the pressure broughtupon the piston in the cylinder M due to the load in the car, would bebalanced by the maximum pressure in the pressure tank H when the weight0 is in the central position.

Fig. 1 shows the mechanism in position for the car to ascend. 'When thecar is ascending the bell crank Z is in the position shown in Fig. 1,and when the car reaches the top the arm T strikes the b pton U liftihgthe automaticliftingro'd'Uand closing the valve S T'The'Taising of rod Ucauses the button Z to strike and raise the bell crank Z and the weight0 is moved to the left, when the mechanism is in position for thedescent of the elevator car. When the car reaches the bottom the arm Tstrikes the button U pushing rod U and closing valve 4; which causes thebutton .2 to strike the arm of the bell crank Z and throw the weight 0to the right, when the mechanism is in position for the car to ascend..When the automatic valve is in this position for the car to ascend, andcloses in this direction, thebutton .ef' follows up the arm of the bellcrank Z, butwhen the bell crank starts in the opposite direction ofcourse the automatic valve being relieved the can stop at pleasure andrun up, but the mechanism is such that he cannot descend until he hasreached the top landing, when the bell crank 2 operates and throws theweight 0 in proper position. With this arrangement it is only necessaryto have a' direct pipe connection with the tank H and simply an ordinarycock or other simple opening to the valve G, the operator opening thevalve in the same direction in either ascending or descending. Inascending the operating valve is open so as to give a free opening tothe cylinder delivery port, and at the same time the weight 0 is thrownto the right of the bell crank. When in this position it places anadditional force to hold the piston of the cylinder M to the right;consequently to keep the piston to the left there must be a greaterpressure in the tank I-I than otherwise would be necessary tocounterbalance the pressure from the bell crank F to the load in thecar, this difference in pressure being sufficient to operate theelevator and give it desired speed. If this additional pressure is notsuflicient to counterbalance the piston M then the weight 0 drops anddraws the piston to the right. In dropping, the weight, 0, by means ofthe link P opens the valve h admitting air from the reservoir H to thetank 11. WVhile this occurs the valve It remains in the same position inconsequence of the connection between link Q and the weight 0 being atthe point on which thebell crank N swings. Cornpressed air continues tobe admitted into the tank H until the pressure in the tank H issufficient to overcome the pressure on the opposite side of the pistoncylinder M, due to the weight of the car and the weight 0. When thepressurein the tank has reached this point then the piston travels tothe left and raises the weight 0, at the same time closing the valve h.The car continues to travel at the will of the operator in thisdirection, and if, during its travel, the pressure in the tank H at anytime falls below the required amount the weight 0 again drops and admitsadditional pressure from the reservoir 11'. In this way the pressure inthe tank His maintained sufficiently to raise the load in the car, andby this means only sufficient power is consumed to overcome the load inthe car and operate the elevator; for, if the load is light then thestrain on the bell crank through the cable is correspondingly light, andthe pressure in the tank to overcome this may also becorrespondinglyless. In descending of course the pressure in thecylinder must be less than the load in the car. To accomplish this theoperator in opening the valve, which he does as before described throughthe operating cablei, and, as before described, at this period when theelevator has reached its maximum elevation the weight 0 is thrown to theleft of the bell crank N, and being in this position it tends to forcethe piston in the cyl1nder M to the left and consequently aids thepressure in the tank H in doing this, the load acting against these twoforces. It the pressure in the tank is sufficient to carry the piston tothe left, then the weight 0 drops, and by means of the link Z and link Qopens the valve 7L3, thereby allowing the air from the tank II to bedischarged, and in consequence reducing the pressure in this tank. Thepoint at which the link Z is attached to the weight being over the pointat which the bell crank is pivoted, it does not move the valve h. Iheair continues to discharge from the tank 1 1 until the pressure isreduced to such an amount that the load in the car through the bellcrank F is sufficientto overcome this pressure and the weight, and forcethe piston in the cylinder M to the right, and in doing so it closesthis valve. In consequence, the pressure in the tank His reducedsufficiently to allow the car to descend and the contents of thecylinder D to be discharged into this tank. By the arrangement describedI am enabled to operate the elevator consumlng power proportionate tothe load. "hat 1s, if it requires ten pounds pressure over ant abovewhat is actually required for the load to overcome the friction and givethe necessary speed to the car, then the weight 0 is adjusted by themeans described, and the pressure in the tank II is maintained at thisadditional amount, thereby raising the load in the manner desired and atthe same time consuming no unnecessary power in doing so. Also indescending, if the same amount of additional power is necessary in thecar to bring the car down, this weight 0 by being thrown in the rightdirection reduces the pressure 1n the tank 1-1 to that amount and inconsequence, when descending with the full load instead of allowing thatmuch power to be wasted, the difference necessary to bring down the loadis stored in the tank and by the additional mechanism hereinbeforedescribed, when the car once starts to ascend the operator can notreverse it nor can he reverse it when it starts to descend.

Instead of a rod U, as shown, it is evident that a chain may be usedprovided with projections, the lower wheel X over which said chainpasses being connected with the armor valve V, as shown in Fig. 3.

In an application filed by me on the date of the filing of thisapplication, Serial No. 452,783, I have illustrated and described, in anhydraulic elevator, a pressure tank, an outlet and a valve thereupon, aninlet from the source of supply and a valve thereupon, a

cylinder opening into the pressure tank and having a piston workingtherein connected with a bell crank in the tank which has a slidableweight upon it, the other end of the piston being connected with anotherbell crank which in turn is connected wit-h the lifting cables, and aconnection between the sliding weight and the valves above mentioned,which in construction and operation are substantially similar to whatI-show and describe herein. I claim therein specifically in combinationthe details just enumerated,

and also claim, broadly such of those parts as nected to the other endof said piston, an in- I let from the source of pressure supply to thepressure tank, a valve on said inlet, connection between said weight andsaid valve, a bell crank, connection between said bell crank and weightO,an upright movable device extending up along the operating cylinder,projections upon said upright device in line with which is the other armof said bell crank, a plunger in the operating cylinder, a projectionfrom said plunger, projections upon said upright device in line withsaid projection. 2. In a hydraulic elevator, the combination of liftingcables, an operating cylinder, a pressure tank, connection between thepressure tank and operating cylinder, a cylinder opening into saidpressure tank, a piston in said cylinder, one end of said pistonconnected to the lifting cables, a movable weight connected to the otherend of said piston, an outlet from said pressure tank, a valve on saidoutlet, connection between said weight and said valve, a bell crank,connection between said bell crank and weight, and upright movabledevice extending up along the operating cylinder, projections upon saidupright device-in line with which is the other arm of said bell crank, aplunger in the operating cylinder, a projection from said plunger,projections upon said upright device in line with said projection. I

3. In a hydraulic elevator, the combination of-lifting cables, anoperating cylinder, a pressure tank, connection between the pressuretank and operating cylinder, a cylinder opening into said pressure tank,a piston in said cylinder, one end of said piston connected to thelifting cables, a movable weight connected to the other end of saidpiston, an in- 7 let from the source of pressure supply to the pressuretank, a valve on said inlet, an out-- lot from said tank, a valve uponsaid outlet, connection between said Weight and said valves, a bellcrank, connection between said bell crank and weight, an upright movabledevice extending up along the operating cylinder, projections upon saidupright device in line with which is the other arm of said bell crank, aplunger in the operating cylinder, a projection from said plunger,projections from said upright device in line with said projection.

In testimony of which invention I have hereunto set my hand.

F. E. HERDMAN.

Witnesses:

W. V. MARTIN, v E. B. KERR.

